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Bought these from Tireracks.com in 11/2019 and used on a 2017 GLS450, less than 5,000 miles on them
They should work for any 2017-2019 GLS450, not sure about 550
Wheels are RIAL M10X 19-inch rim
Tires are Continental Viking Contact 7 265/55R19
I have a similar set for $500 for pickup in NJ - it listed in this website martket place forum, which is where I think these type of posts are supposed to be put.